Daled IV
Daled IV is the fourth planet in the Daled system. It is home to a species of shapeshifters known as Allasomorphs that have long been divided into two factions by a civil war that has gone on for centuries.
The planet is tidally-locked to the star Daled, meaning on one side of the planet it is always day, and on the other side it is always night. A separate culture has evolved on each side, and they long ago went to war with each other.
Daled IV also has at least three moons, and its third moon is inhabited and similar to Earth's moon Luna.
In 2349, a man from one side and a woman from the other had a child, Salia, hoping that her not being from either side would one day allow her to neutrally govern and unify the planet. They contacted the Federation, and asked for a Starfleet ship to transport her to Klavdia III, where she was to train for sixteen years before her return. The parents died shortly thereafter.
In 2365, Starfleet sent the USS Enterprise-D to Klavdia III to pick up Salia, and transport her (and her caretaker Anya) back to Daled IV. Although Salia was slightly reluctant to govern her people, she did decide to beam down and take her place in the government. (TNG: "The Dauphin")
Daled IV also appeared in the starchart Data and Picard were studying in stellar cartography in 2371. (Star Trek Generations)